Hi guys I'm quite new to building a pic and which parts to use I was thinking a pic for Christmas, but want to get the pic ready for Christmas Day I was wondering what parts to use, I only have a £500 budget AT MOST so I can't go overkill with Rzen 1700x and a water cooling loop, but want something cheap ish that will let me play games like rainbow six siege and destiny 2 at 60'fps or higher thanks

You have two problems. One is that the UK pays heavily for electronics. The second problem you are going to have is the GPU, which prices are still inflated on heavily thanks to cryptominers, so £500 for a whole system will not get you something you can game on. Here's what I'd suggest (prices from Scan.co.uk)